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Let me share a minor issue in Exchange 2016 OWA which I faced today in my new project.

 

Issue:

Exchange 2016 ECP works as expected.

Exchange 2016 OWA was not working and giving “500 something went wrong” error.

We got the following event Id in the Application log.

Details of the event:

Log Name:      Application

Source:        ASP.NET 4.0.30319.0

Date:          2/19/2016 11:29:29 AM

Event ID:      1310

Task Category: Web Event

Level:         Warning

Keywords:      Classic

User:          N/A

Computer:      ex1601.MSExchangeGuru.com

Description:

Event code: 3008

Event message: A configuration error has occurred.

Event time: 2/19/2016 11:29:29 AM

Event time (UTC): 2/19/2016 4:29:29 PM

Event ID: 20f33ea6c8a047ebbb6cc4881f26fbad

Event sequence: 1

Event occurrence: 1

Event detail code: 0

Application information:

    Application domain: /LM/W3SVC/2/ROOT/Microsoft-

    Trust level: Full

    Application Virtual Path: /Microsoft-Server-

    Application Path: C:\Program Files\Microsoft\Exchange Server\V15\ClientAccess\sync\

    Machine name: EX1601

Process information:

    Process ID: 8260

    Process name: w3wp.exe

    Account name: NT AUTHORITY\SYSTEM

Exception information:

    Exception type: ConfigurationErrorsException

    Exception message: Could not load file or assembly ‘Microsoft.Exchange.Security, Version=15.0.0.0, Culture=neutral, PublicKeyToken=31bf385621ad364e35’ or one of its dependencies. The system cannot find the file specified. (C:\Program Files\Microsoft\Exchange Server\V15\ClientAccess\sync\web.config line 250)

   at System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective)

   at System.Web.Configuration.CompilationSection.LoadAssembly(AssemblyInfo ai)

   at System.Web.Compilation.BuildManager.GetReferencedAssemblies(CompilationSection compConfig)

   at System.Web.Compilation.BuildManager.GetPreStartInitMethodsFromReferencedAssemblies()

   at System.Web.Compilation.BuildManager.CallPreStartInitMethods(String preStartInitListPath, Boolean& isRefAssemblyLoaded)

   at System.Web.Compilation.BuildManager.ExecutePreAppStart()

   at System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters, PolicyLevel policyLevel, Exception appDomainCreationException)

Could not load file or assembly ‘Microsoft.Exchange.Security, Version=15.0.0.0, Culture=neutral, PublicKeyToken=31bf385621ad364e35’ or one of its dependencies. The system cannot find the file specified.

   at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)

   at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)

   at System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean forIntrospection)

   at System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)

   at System.Reflection.Assembly.Load(String assemblyString)

   at System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective)

 

Resolution:

1. Copied sharedWebConfig.config file from C:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\HttpProxy directory.
   
2. Pasted sharedWebConfig.config file in C:\Program Files\Microsoft\Exchange Server\V15\ClientAccess directory
   
3. IISreset /noforce

 

Conclusion:

sharedWebConfig.config was missing in the ClientAccess folder. This may happen because of your setup had crashed or manual deletion of the file or Antivirus capture of the file.

 

Reference:

https://support.microsoft.com/en-us/kb/3099532

 

Prabhat Nigam

Microsoft MVP | Exchange Server

Team@MSExchangeGuru

Posted February 19th, 2016 under Exchange 2016, OWA. Tags: Could not load file or assembly 'Microsoft.Exchange.Security, PublicKeyToken=31bf385621ad364e35' or one of its dependencies. The system cannot find the file specified., something went wrong
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